Non-uniform power divider with integrated band-pass filtering function

Abstract

Disclosed is an unequal power divider integrated with a bandpass filter function, comprising: an upper-layer microstrip structure, an isolation element, a middle-layer dielectric substrate and a lower-layer grounding metal plate. Each unequal power divider integrated with a bandpass filter function comprises two single-frequency bandpass filter circuits and an isolation element connected between the two single-frequency bandpass filter circuits. The input impedance and the output impedance of the unequal power divider are the same, and the input and output impedance of each of the single-frequency bandpass filter circuit can be adjusted by changing the coupling intensity between resonators and a port location, so as to conduct power distribution of different ratios and achieve matching. The present invention can omit a quarter-wavelength impedance transforming section required by a traditional unequal Wilkinson power divider at an output port, thereby effectively reducing the dimensions. The present invention can be used in various types of radio-frequency front-end systems, and has the functions of power distribution and frequency selection at the same time, thereby being beneficial to the integration and miniaturization of a device.

Description

technical field [0001] The invention relates to a power divider with filter function, in particular to a non-equal power divider with integrated single-frequency band-pass filter function applicable to radio frequency front-end circuits. Background technique [0002] Power splitters are a fundamental part of microwave circuits and are used in many antenna arrays and balanced circuits because of their ability to separate and combine signals. The band-pass filter circuit is another indispensable part in the wireless communication system, because it can separate the required frequency band. Both elements are present in many microwave systems. [0003] In the past few decades, there has been a lot of research on power dividers. The focus of the research is widening the frequency band, reducing the area, dual frequency response and harmonic suppression. At the same time, band-pass filter circuit is also an important research field in passive circuit design. Single-passband an...

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Problems solved by technology

In D. Hawatmeh, K.A. Shamaileh and N. Dib, “Design and Analysis of Compact Unequal-Split Wilkinson Power Divider Using Non-Uniform Transmission Lines,” Applied Electrical Engineering and Computing Technologies, pp.1-6, Dec, 2011. In the paper, the author replaces the traditional uniform transmission line with a non-uniform transmission line, which effectively reduces the size, but this structure still needs to add a quarter-wavelength impedance transformation section at the output port position, the size cannot be further reduced, and there is no filtering function

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